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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7788) HA: Simple HealthMonitor class to watch an HAService
Date Tue, 13 Mar 2012 00:52:39 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228100#comment-13228100
] 

Todd Lipcon commented on HADOOP-7788:
-------------------------------------

Oh, sorry, I also left in the main() method. Though the test covers the code fairly well,
having a main() method is helpful for manual testing of some things like kill -STOPping the
monitored process and making sure timeouts are handled correctly, etc. That's hard to mock
out.
                
> HA: Simple HealthMonitor class to watch an HAService
> ----------------------------------------------------
>
>                 Key: HADOOP-7788
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7788
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: ha
>    Affects Versions: 0.24.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hadoop-7788.txt, hdfs-2524.txt
>
>
> This is a utility class which will be part of the FailoverController. The class starts
a daemon thread which periodically monitors an HAService, calling its monitorHealth function.
It then generates callbacks into another class when the health status changes (eg the RPC
fails or the service returns a HealthCheckFailedException)

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